Cable broadband routerfirewall NAT settings.

I'm new to routers and I'm trying to set up a new D Link dir655n router,
It has the following options for NAT-Endpoint independant, Address restricted and Address + Port restriction.
My wife and I are the only users of the pc and are pretty aware of where we're going in the web.
Any suggestions for which setting would be best?
We rarely do games. I download a lot of music and a little video. She just wanders.
Thanks.
Doc